How much does foundation crack repair cost?
Budget $250–$800 per crack. That is the honest answer for the overwhelming majority of jobs: a single crack, sealed or injected, by a contractor who is already on site. Pricing is driven by the number of cracks, the method, and whether the crack is structural. Sealing a hairline crack against moisture is cheap; injecting a structural crack with epoxy and adding carbon-fiber reinforcement is several times more. The calculator above prices per crack so you can match it to what you actually see on your wall.
Cost by number of cracks
Most of a crack-repair invoice is the trip and the setup, so the second and third crack cost less than the first. Typical all-in totals:
The low end of each row is surface sealing of cosmetic cracks; the high end is epoxy or polyurethane injection. If a contractor quotes the high end for what look like hairline cracks, ask which method they are pricing and why.
Repair methods and what they cost
The catch: cracks are often a symptom
A crack is sometimes just a crack — but it’s often the visible sign of movement underneath: settlement, heave, or hydrostatic pressure. Injecting the crack without addressing the cause means it comes back. That’s why a structural engineer’s inspection (about $350–$1,000) is money well spent before you pay for repairs — it tells you whether you’re fixing a crack or a foundation.
Frequently asked questions
How much does it cost to fix a foundation crack?
A single crack typically runs $250–$800 to seal or inject. Cosmetic hairline cracks sit at the low end; structural cracks that need epoxy or polyurethane injection — sometimes with carbon-fiber reinforcement — run higher. Several cracks, or cracks that signal underlying settlement, push the total up quickly.
Epoxy vs. polyurethane injection — what’s the difference?
Epoxy is rigid and bonds the concrete back to structural strength, so it’s used for structural cracks in poured walls. Polyurethane stays flexible and expands to seal against water, so it’s the choice for leaking, non-structural cracks. A pro picks based on whether the crack is structural and whether it’s actively leaking.
Can I repair a foundation crack myself?
DIY crack-injection kits exist for $50–$150 and can work on minor, non-structural hairline cracks. But if the crack is horizontal, wider than about ¼ inch, stair-stepped, or growing, that signals movement — get a structural engineer rather than caulking over a symptom.
When is a foundation crack serious?
Vertical hairline cracks are usually cosmetic. Horizontal cracks, stair-step cracks in block, cracks wider than ¼ inch, offsets where one side is higher, and sticking doors or windows are warning signs of structural movement that warrant an inspection.
How much does it cost to repair a foundation crack from the outside?
Exterior repair means excavating down to the footing, so it is far more expensive: roughly $1,500–$4,000 for a single crack, most of it digging and backfill. Contractors default to interior injection precisely because it avoids that cost. Exterior work is reserved for cracks that keep leaking after injection or walls that also need a waterproof membrane while the trench is open.
Does homeowners insurance cover foundation crack repair?
Usually not. Standard HO-3 policies exclude settling, cracking, and earth movement — the causes behind most foundation cracks. Coverage applies when a sudden covered peril caused it, such as a burst supply line washing out soil under the footing. Run your cause through the insurance verdict tool before assuming either answer.
Sources & methodology
- Foundation repair cost data — Angi (industry cost guide)
- Foundation repair cost data — Bob Vila (citing Angi)
- Foundation repair cost & insurance — NerdWallet
- A licensed structural engineer / foundation contractor in your area — the authoritative source for diagnosis, scope, and a stamped repair plan
Estimates compiled from the sources above and standard cost models — not engineering, professional, insurance, or legal advice, and may not reflect your policy or local prices. See our full methodology and disclaimer.